Tcl

Tcl, aka Tool Command Language, is a programming language created in 1988 by John Ousterhout.

#53on PLDB	35Years Old	3.1kUsers
26Books	2Papers	14kRepos

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Tcl (pronounced "tickle" or tee cee ell, ) is a high-level, general-purpose, interpreted, dynamic programming language. It was designed with the goal of being very simple but powerful. Tcl casts everything into the mold of a command, even programming constructs like variable assignment and procedure definition. Read more on Wikipedia...

Tcl website
Tcl Wikipedia page
PLDB has 2 documentation sites for Tcl: www.tcl.tk, devdocs.io
There are at least 13,969 Tcl repos on GitHub
file extensions for Tcl include tcl, tbc, adp, tclin, tm and rvt
The Google BigQuery Public Dataset GitHub snapshot shows 7k users using Tcl in 8k repos on GitHub
There are 71 Project Euler users using Tcl
Explore Tcl snippets on Rosetta Code
Tcl appears in the TIOBE Index
Tcl Ubuntu package
CodeMirror package for syntax highlighting Tcl
Monaco package for syntax highlighting Tcl
Pygments supports syntax highlighting for Tcl
GitHub supports syntax highlighting for Tcl
Tcl appears in the Quine Relay project
There is 1 Jupyter Kernel for Tcl
Release Notes for Tcl
Official Blog page for Tcl
See also: (22 related languages)awk, Lisp, PHP, Tea, PowerShell, C, Python, Expect, Unicode, Regular Expressions, Java, Unix, Linux, Bourne shell, XOTcl, Snit, Verilog, VHDL, UDP, MySQL, PostgreSQL, SQLite
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Example from Riju:

puts {Hello, world!}

Example from hello-world:

puts "Hello World"

Example from the Hello World Collection:

#!/usr/local/bin/tclsh
# Hello World in Tcl

puts "Hello World!"

Example from Linguist:

# XDG Base Directory Specification handling
#
# Copyright (C) 2013 Lawrence Woodman
#
# Licensed under an MIT licence.  Please see LICENCE.md for details.
#
# For XDG Base Directory Specification
#   http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
#
package require Tcl 8.5

namespace eval XDG {
  variable DEFAULTS ""
  namespace export DATA_HOME CONFIG_HOME CACHE_HOME
  namespace export RUNTIME_DIR DATA_DIRS CONFIG_DIRS
}

proc XDG::SetDefaults {} {
  variable DEFAULTS
  if {$DEFAULTS ne ""} return
  set DEFAULTS [list \
    DATA_HOME   [file join $::env(HOME) .local share] \
    CONFIG_HOME [file join $::env(HOME) .config] \
    CACHE_HOME  [file join $::env(HOME) .cache] \
    DATA_DIRS   [list [file join /usr local share] [file join /usr share]] \
    CONFIG_DIRS [list [file join /etc xdg ]]
  ]
}

proc XDG::XDGVarSet {var} {
  expr {[info exists ::env(XDG_$var)] && $::env(XDG_$var) ne ""}
}

proc XDG::Dir {var {subdir ""} } {
  variable DEFAULTS
  SetDefaults
  set dir [dict get $DEFAULTS $var]

  if {[XDGVarSet $var]} {
    set dir $::env(XDG_$var)
  }

  return [file join $dir $subdir]
}

proc XDG::Dirs {var {subdir ""} } {
  variable DEFAULTS
  SetDefaults
  set rawDirs [dict get $DEFAULTS $var]

  if {[XDGVarSet $var]} {
    set rawDirs [split $::env(XDG_$var) ":"]
  }

  set outDirs {}
  foreach dir $rawDirs {
    lappend outDirs [file join $dir $subdir]
  }
  return $outDirs
}

# The remaining procs reference the environmental variables XDG_
# followed by the proc name.
proc XDG::DATA_HOME {{subdir ""}} {Dir DATA_HOME $subdir}
proc XDG::CONFIG_HOME {{subdir ""}} {Dir CONFIG_HOME $subdir}
proc XDG::CACHE_HOME {{subdir ""}} {Dir CACHE_HOME $subdir}

proc XDG::RUNTIME_DIR {{subdir ""}} {
  if {![XDGVarSet RUNTIME_DIR]} { return {} }
  return [file join $::env(XDG_RUNTIME_DIR) $subdir]
}

# The following procs returning the directories as a list with the most
# important first.
proc XDG::DATA_DIRS {{subdir ""}} {Dirs DATA_DIRS $subdir}
proc XDG::CONFIG_DIRS {{subdir ""}} {Dirs CONFIG_DIRS $subdir}

Example from Wikipedia:

oo::class create fruit {
    method eat {} {
        puts "yummy!"
    }
}
oo::class create banana {
    superclass fruit
    constructor {} {
        my variable peeled
        set peeled 0
    }
    method peel {} {
        my variable peeled
        set peeled 1
        puts "skin now off"
    }
    method edible? {} {
        my variable peeled
        return $peeled
    }
    method eat {} {
        if {![my edible?]} {
            my peel
        }
        next
    }
}
set b [banana new]
$b eat               → prints "skin now off" and "yummy!"
fruit destroy
$b eat               → error "unknown command"

Feature	Supported	Token	Example
Strings	✓	"	"Hello world"
Print() Debugging	✓	puts
Line Comments	✓	#	# A comment
Comments	✓
Case Insensitive Identifiers	X
Semantic Indentation	X
MultiLine Comments	X

title	author	year	reviews	ratings	rating
Practical Programming in TCL & TK	Brent B. Welch	1961	2	55	3.87
Effective Tcl/TK Programming: Writing Better Programs with TCL and TK	Mark Harrison	1997	0	4	3.50
Tcl/TK Pocket Reference: Programming Tools	Paul Raines	1998	0	9	3.22
TCL/TK Programmer's Reference	Chris Nelson	1999	1	1	5.00
Tcl/Tk 8.5 Programming Cookbook	Bert Wheeler	2011	0	1	3.00
Tcl/TK Programming for the Absolute Beginner	Kurt Wall	2007	1	1	4.00
TCL 8.5 Network Programming	Wojciech Kocjan	2010	1	3	3.67
Tcl/TK: A Developer's Guide	Clif Flynt	2003	0	0	0.0
TCL/TK for Dummies?	Tim Webster	1997	0	2	3.50
CGI Programming with TCL [With CDROM]	David Maggiano	1999	0	0	0.0

Books about Tcl from ISBNdb

title	authors	year	publisher
Effective Tcl/TK Programming: Writing Better Programs with TCL and TK	Harrison, Mark and McLennan, Michael	1997	Addison-Wesley Professional
Tcl and the Tk Toolkit	Ousterhout, John and Jones, Ken	2009	Addison-Wesley Professional
Tcl 8.5 Network Programming (Community Experience Distilled)	Kocjan, Wojciech and Beltowski, Piotr	2010	Packt Publishing
Cgi Developer's Resource: Web Programming in Tcl and Perl (Resource Series)	Ivler, J. M. and Husain, Kamran	1997	Prentice Hall Ptr
Web TCL Complete	Stephen Ball	1999	McGraw-Hill Inc.,US
Practical Programming in Tcl and Tk	Welch, Brent and Jones, Ken	2003	Pearson
The Tcl Programming Language: A Comprehensive Guide	Nadkarni, Ashok P.	2017	CreateSpace Independent Publishing Platform
Practical Programming in Tcl & Tk	Welch, Brent B.	1997	Prentice Hall
TCL / TK in a Nutshell: A Desktop Quick Reference	Raines, Paul and Tranter, Jeff	1999	O'Reilly Media
Tcl and Tk Programming for the Absolute Beginner	Wall, Kurt	2007	Cengage Learning PTR
Tcl and the Tk Toolkit	Ousterhout, John K.	1994	Addison-Wesley Professional
Practical Programming in Tcl and Tk (3rd Edition)	Welch, Brent B.	1999	Prentice Hall
Practical Programming in Tcl and Tk/Book and Disk	Welch, Brent B.	1995-04T	Prentice Hall
Cgi Programming With Tcl	David Maggiano	1999	Addison-wesley
Tcl 8.5 Network Programming	Wojciech Kocjan; Piotr Beltowski	20100701	Packt Publishing
Tcl And The Tk Toolkit	Ousterhout, John K.	1994	Addison-wesley

title	authors	year	citations	influentialCitations
VIPERS: a data flow visual programming environment based on the Tcl language	Massimo Bernini and M. Mosconi	1994	21	3
Petascale Tcl with NAMD, VMD, and Swift/T	James C. Phillips and J. Stone and Kirby L. Vandivort and Timothy G. Armstrong and J. Wozniak and M. Wilde and K. Schulten	2014	18	0

Tcl - Programming language

Language features

Books about Tcl on goodreads

Books about Tcl from ISBNdb

Publications about Tcl from Semantic Scholar